How to calculate qtc manually4/30/2023 ![]() ![]() A wealth of correctional formulae have been derived, but none has proven superior. Therefore, the QT interval often requires “correction” for the current heart rate, in order to correctly stratify the risk of torsades de pointes. This is a difficult task, as the normal QT interval is typically measured relative to the heart rate. Automated ECG printouts cannot be relied upon to diagnose QT interval prolongation thus, the onus is on the clinician to identify it. ![]() Detection of a prolonged QT interval is essential as this can be a reversible problem, particularly in the context of the use of a variety of commonly prescribed medications in the hospital setting. Abnormal prolongation of the QT interval can lead to torsades de pointes, a form of potentially life-threatening polymorphic ventricular tachycardia (VT). This interval represents the time taken for the ventricles to completely repolarise after activation. One of the more challenging aspects of ECG interpretation is measurement and interpretation of the QT interval. ![]()
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